tree wind, I do think it is useful for getting a good idea for particular dance speed.
Tootlers clip, and analysis of dancing speed for the liverpool hornpipe, 58 for 59 bpm is useful info, it doesnt mean that it always has to be played at that speed but it is some guidance.
and means if you have to play for dancers, you have good idea of the approximate speed that is likely to be suitable,although my experience has been that dancers will soon tell you if they want it a bit faster or slower , watching the dancers is important too.